If you can find a used/no good one there are places that rebuild mounts. Just had a rear pair done for a 40 Pontiac 6. As along as you have the steel part they can mold the rubber part. If all else fails go to your FLAPS and look at the transmission mounts as many of them are rectangular with studs/bolts on both the bottom and top. Probably have to drill holes to fit in front engine plate. For much more stable engine mounts weld an arm off each side of the front plate and use flathead Ford mounts. Corvette did this and had the mount plate attached with the water pump bolts.

Evan